fix uninitialized VideoModeParams

stepmania/src/RageDisplay_Null.cpp

@@ -86,9 +86,10 @@ static RageDisplay::PixelFormatDesc PIXEL_FORMAT_DESC[RageDisplay::NUM_PIX_FORMA
 };
 
 
-RageDisplay_Null::RageDisplay_Null()
+RageDisplay_Null::RageDisplay_Null( VideoModeParams p )
 {
 	LOG->MapLog("renderer", "Current renderer: null");
+	SetVideoMode( p );
 }
 
 SDL_Surface* RageDisplay_Null::CreateScreenshot()

stepmania/src/RageDisplay_Null.h

@@ -4,7 +4,7 @@
 class RageDisplay_Null: public RageDisplay
 {
 public:
-	RageDisplay_Null();
+	RageDisplay_Null( VideoModeParams p );
 	void Update( float fDeltaTime ) { }
 
 	bool IsSoftwareRenderer() { return false; }

stepmania/src/StepMania.cpp

@@ -656,7 +656,7 @@ RageDisplay *CreateDisplay()
 #endif
 		}
 		else if( sRenderer.CompareNoCase("null")==0 )
-			return new RageDisplay_Null();
+			return new RageDisplay_Null( params );
 		else
 			RageException::Throw("Unknown video renderer value: %s", sRenderer.c_str() );
 	}